I tried them once about 5 years ago, and vowed to never ever use them again. They will indeed help with water clarity. Depending on your bioload and feeding schedules, which would determine if I used one again? Why? Well, back in the day I changed/rotated a set of them out every 3 days. I placed it in my fug in line with direct capture from my tank above. After about 2 weeks of initial usages, and rotating them out every 3 days, I missed one day. While watching a game one Saturday, I heard water trickling. I turn the sound on the TV down, and it got louder. I ran over to my tank and open the door and sure enough, the sock was clogged and was spilling water over the edge of my refugium into the cabinet. For that reason alone, I yanked it and simple maintained a regular WC schedule and my water quality never suffered.

I use to wash my socks at the car wash with a power sprayer. I kept it at least 4 feet away as the excessive water force would shred the sock.

I guess they are great for some in certain situations, just didn't work well for me. Many reefers strongly advise against them for the reason I listed above.

Good luck.

Mucho Reef